Comparison

Happay vs Rapid & Quick Calculator Pro

Price, ratings, monetisation and update history for both apps, side by side — with what reviewers say about each.

Head to head
About

Happay

Features
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Happay is a platform that focuses on corporate business travel reimbursement and expense management. It can manage corporate expense reimbursement and public payments in accordance with the cost center. At the same time, it integrates functions such as business travel application, invoice collection, reimbursement approval, expense control, accounting vouchers, expense analysis and system integration, and realizes one-stop closed-loop management around the enterprise reimbursement link. So as to solve the pain points of enterprise expense reimbursement and control in an all-round way, help enterprises comprehensively standardize reimbursement management, improve reimbursement efficiency, strengthen expense control and realize system connection. 【Feature Highlights】 1. Business travel management Connect with Ctrip Business Travel and China Lodging Hotels Group, support monthly settlement, pre-deposit, unified invoicing and unified account reconciliation 2. Intelligent invoice collection Support scanning the QR code of the value-added tax invoice to automatically identify the invoice information and automatically obtain the electronic invoice Support invoice authenticity check, and check invoice reimbursement 3. Full expense reimbursement and payment The reimbursement form supports multi-dimensional project accounting: cost center, department, project, customer The reimbursement form is associated with the loan form, and the loan is automatically written off Employees who have multiple jobs across departments can designate expense-bearing departments 4. Budget preparation and control Prepare and adjust budgets according to dimensions such as year/quarter/month, cost center, project, department, employee, and expense category The system automatically freezes the budget when the reimbursement form is submitted, and the system automatically releases the budget when the reimbursement form is withdrawn, returned, or invalidated Support two over-budget control methods, over-budget cannot be submitted or over-budget can be submitted 5. Reimbursement standard setting Support the setting of reimbursement standards for all expense categories, and provide standard templates for accommodation, catering, air tickets, communication fees, self-driving cars and subsidies 6. Approval process Support custom approvers and approval conditions, level by level approval according to approval authority and organizational structure 7. Print the expense report Print the reimbursement form through the web page and generate the QR code of the reimbursement form 8. Bookkeeping vouchers Docking with financial systems such as Kingdee, Yonyou, SAP, Oracle, etc. to realize automatic synchronization of accounting vouchers 9. Cost analysis Generate expense analysis reports in multiple dimensions such as cost center, project, department, employee, expense category, etc., and support step-by-step drill-down to the reimbursement document details

About

Rapid & Quick Calculator Pro

This calculator app offers essential functions plus advanced features like sales tax and discount calculations. Easily reuse past answers, edit expressions with cursor keys, and customize themes and fonts. Share your calculations with others.

Highlights
  • History tape for reusing answers
  • Sales tax and discount calculations
  • Precise rounding settings
  • Editable expressions with cursor keys
  • Multiple color themes and font options
  • Share expressions and answers
Features
Currently charting
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Over 300,000 downloads worldwide! A fast, friendly calculator built for everyday use — shopping, splitting bills, household budgeting, and more. FEATURES * History Tape — review your past calculations and reuse any answer with a single tap * Expression Input — type the whole equation, just like you'd write it on paper * Sales Tax — toggle tax-included/excluded with a single button; swipe to switch between multiple tax rates * Percentage Discounts — e.g. 100 - 30% = 70 * Precise Rounding Settings * Multiple Color Themes * Multiple Font Sizes and Typefaces * Arrow Keys — move the cursor left or right to edit any part of the expression * Share — send expressions and answers to other apps * iPad Support — including Slide Over and Split View on supported devices * Sound Effects To reuse or edit an equation from your history, swipe left on it (or touch and hold) to open the menu. We'd love to hear your feedback!

Screenshots

Happay4 screens
Rapid & Quick Calculator Pro4 screens

Verdict

The call

The clearest difference is price: Happay at Free against Rapid & Quick Calculator Pro's $3.99. Happay also leads on ads (none vs shown) and update cadence (every 3 weeks vs every 5 months). Rapid & Quick Calculator Pro's advantage is chart position (#197 vs unranked). On in-app purchases and device support there is nothing between them.

Scored on Price · Rating · Positive reviews · Number of ratings · Update frequency · Ads · In-app purchases · Monetization · Best chart rank · Devices · Requires iOS

CostPrice · In-app purchases · Ads · Monetization

Happay is free to download; Rapid & Quick Calculator Pro costs $3.99 up front. Neither carries in-app purchases, so what you see is what you pay.

UpkeepUpdate frequency

Happay ships an update every 3 weeks, Rapid & Quick Calculator Pro every 5 months. The most recent releases landed on October 24, 2026 and November 2, 2026 respectively.

Scorecard5 real differences · 6 level
Happay versus Rapid & Quick Calculator Pro: the parameters behind the verdict, then further details
ParameterHappayRapid & Quick Calculator Pro
PriceFree — better$3.99
Rating—4.9 (206 ratings) — better
Positive reviews—90.1% of reviews
Number of ratings—206 — better
Update frequencyEvery 3 weeks — betterEvery 5 months
AdsNo — betterYes
In-app purchasesNoNo
Monetization—Paid
Best chart rank—#197 — better
DevicesiPhone, iPad, iPod — betteriPhone, iPad
Requires iOS15.6 — better17.6
Further details — not scored
Size94 MB7 MB
Age rating4+4+
DeveloperShanghai Galaxy Information & Technology Co., Ltd.KinkumaDesign

Bugs and requests

Happay

Not enough reviews yet to summarise bugs or requests.

Rapid & Quick Calculator Pro

Reported bugs

8 issues
  • App crashes when pasting copied expression and pressing equals
  • Random calculations appear in current box after clearing and reopening
  • Laggy drawing of input on startup
  • App becomes unusable on iPad after screen switching
  • Swipe response is poor
Show 3 more
  • Sound effects stopped working despite being enabled
  • History is lost when switching to background and returning
  • Paid version tax buttons are not functional

Requested features

11 requests
  • Dark mode for icon
  • Larger calculation display window
  • Separate tax buttons (pre/post tax)
  • Vibration option for input
  • Add memo to history
Show 6 more
  • Sort history by newest
  • Button for billions/ten millions
  • Square root function
  • Setting for decimal places
  • Setting for decimal marks
  • Continuous calculation without equals

In-app purchases

None

Happay

No in-app purchases

None

Rapid & Quick Calculator Pro

No in-app purchases

Questions

Is Happay free?
Happay is free to download, with no in-app purchases.
Is Rapid & Quick Calculator Pro free?
Rapid & Quick Calculator Pro costs $3.99, with no in-app purchases.
Do Happay or Rapid & Quick Calculator Pro have ads?
Rapid & Quick Calculator Pro shows ads; Happay does not.
Which is updated more often, Happay or Rapid & Quick Calculator Pro?
Happay ships an update every 3 weeks, and Rapid & Quick Calculator Pro every 5 months. Most recently, Happay was updated on October 24, 2026 and Rapid & Quick Calculator Pro on November 2, 2026.

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